| // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'package:string_scanner/string_scanner.dart'; |
| |
| /// A regular expression that matches text until a letter or whitespace. |
| /// |
| /// This is intended to scan through a number without actually encoding the full |
| /// Dart number grammar. It doesn't stop on "e" because that can be a component |
| /// of numbers. |
| final _untilUnit = new RegExp(r"[^a-df-z\s]+", caseSensitive: false); |
| |
| /// A regular expression that matches a time unit. |
| final _unit = new RegExp(r"([um]s|[dhms])", caseSensitive: false); |
| |
| /// A regular expression that matches a section of whitespace. |
| final _whitespace = new RegExp(r"\s+"); |
| |
| /// A class representing a modification to the default timeout for a test. |
| /// |
| /// By default, a test will time out after 30 seconds. With [new Timeout], that |
| /// can be overridden entirely; with [new Timeout.factor], it can be scaled |
| /// relative to the default. |
| class Timeout { |
| /// A constant indicating that a test should never time out. |
| static const none = const Timeout._none(); |
| |
| /// The timeout duration. |
| /// |
| /// If set, this overrides the default duration entirely. It's `null` for |
| /// timeouts with a non-null [scaleFactor] and for [Timeout.none]. |
| final Duration duration; |
| |
| /// The timeout factor. |
| /// |
| /// The default timeout will be multiplied by this to get the new timeout. |
| /// Thus a factor of 2 means that the test will take twice as long to time |
| /// out, and a factor of 0.5 means that it will time out twice as quickly. |
| /// |
| /// This is `null` for timeouts with a non-null [duration] and for |
| /// [Timeout.none]. |
| final num scaleFactor; |
| |
| /// Declares an absolute timeout that overrides the default. |
| const Timeout(this.duration) : scaleFactor = null; |
| |
| /// Declares a relative timeout that scales the default. |
| const Timeout.factor(this.scaleFactor) : duration = null; |
| |
| const Timeout._none() |
| : scaleFactor = null, |
| duration = null; |
| |
| /// Parse the timeout from a user-provided string. |
| /// |
| /// This supports the following formats: |
| /// |
| /// * `Number "x"`, which produces a relative timeout with the given scale |
| /// factor. |
| /// |
| /// * `(Number ("d" | "h" | "m" | "s" | "ms" | "us") (" ")?)+`, which produces |
| /// an absolute timeout with the duration given by the sum of the given |
| /// units. |
| /// |
| /// * `"none"`, which produces [Timeout.none]. |
| /// |
| /// Throws a [FormatException] if [timeout] is not in a valid format |
| factory Timeout.parse(String timeout) { |
| var scanner = new StringScanner(timeout); |
| |
| // First check for the string "none". |
| if (scanner.scan("none")) { |
| scanner.expectDone(); |
| return Timeout.none; |
| } |
| |
| // Scan a number. This will be either a time unit or a scale factor. |
| scanner.expect(_untilUnit, name: "number"); |
| var number = double.parse(scanner.lastMatch[0]); |
| |
| // A number followed by "x" is a scale factor. |
| if (scanner.scan("x") || scanner.scan("X")) { |
| scanner.expectDone(); |
| return new Timeout.factor(number); |
| } |
| |
| // Parse time units until none are left. The condition is in the middle of |
| // the loop because we've already parsed the first number. |
| var microseconds = 0.0; |
| while (true) { |
| scanner.expect(_unit, name: "unit"); |
| microseconds += _microsecondsFor(number, scanner.lastMatch[0]); |
| |
| scanner.scan(_whitespace); |
| |
| // Scan the next number, if it's avaialble. |
| if (!scanner.scan(_untilUnit)) break; |
| number = double.parse(scanner.lastMatch[0]); |
| } |
| |
| scanner.expectDone(); |
| return new Timeout(new Duration(microseconds: microseconds.round())); |
| } |
| |
| /// Returns the number of microseconds in [number] [unit]s. |
| static double _microsecondsFor(double number, String unit) { |
| switch (unit) { |
| case "d": |
| return number * 24 * 60 * 60 * 1000000; |
| case "h": |
| return number * 60 * 60 * 1000000; |
| case "m": |
| return number * 60 * 1000000; |
| case "s": |
| return number * 1000000; |
| case "ms": |
| return number * 1000; |
| case "us": |
| return number; |
| default: |
| throw new ArgumentError("Unknown unit $unit."); |
| } |
| } |
| |
| /// Returns a new [Timeout] that merges [this] with [other]. |
| /// |
| /// [Timeout.none] takes precedence over everything. If timeout is |
| /// [Timeout.none] and [other] declares a [duration], that takes precedence. |
| /// Otherwise, this timeout's [duration] or [factor] are multiplied by |
| /// [other]'s [factor]. |
| Timeout merge(Timeout other) { |
| if (this == none || other == none) return none; |
| if (other.duration != null) return new Timeout(other.duration); |
| if (duration != null) return new Timeout(duration * other.scaleFactor); |
| return new Timeout.factor(scaleFactor * other.scaleFactor); |
| } |
| |
| /// Returns a new [Duration] from applying [this] to [base]. |
| /// |
| /// If this is [none], returns `null`. |
| Duration apply(Duration base) { |
| if (this == none) return null; |
| return duration == null ? base * scaleFactor : duration; |
| } |
| |
| int get hashCode => duration.hashCode ^ 5 * scaleFactor.hashCode; |
| |
| bool operator ==(other) => |
| other is Timeout && |
| other.duration == duration && |
| other.scaleFactor == scaleFactor; |
| |
| String toString() { |
| if (duration != null) return duration.toString(); |
| if (scaleFactor != null) return "${scaleFactor}x"; |
| return "none"; |
| } |
| } |